{"cve":"CVE-2020-15813","nvd":{"published":"2020-07-17T19:15:12.547","modified":"2026-06-17T02:57:14.260","status":"Modified","description":"Graylog before 3.3.3 lacks SSL Certificate Validation for LDAP servers. It allows use of an external user/group database stored in LDAP. The connection configuration allows the usage of unencrypted, SSL- or TLS-secured connections. Unfortunately, the Graylog client code (in all versions that support LDAP) does not implement proper certificate validation (regardless of whether the \"Allow self-signed certificates\" option is used). Therefore, any attacker with the ability to intercept network traffic between a Graylog server and an LDAP server is able to redirect traffic to a different LDAP server (unnoticed by the Graylog server due to the lack of certificate validation), effectively bypassing Graylog's authentication mechanism.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-295"],"references":["https://github.com/Graylog2/graylog2-server/issues/5906","https://github.com/Graylog2/graylog2-server/issues/5906"],"products":["graylog:graylog"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-15813","score":0.00779,"percentile":0.5591,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3gg9-f3vh-866f","url":"https://osv.dev/vulnerability/GHSA-3gg9-f3vh-866f","summary":"Improper Certificate Validation in Graylog","modified":"2023-11-08T04:02:38.210527Z","packages":[{"ecosystem":"Maven","name":"org.graylog:graylog-parent","purl":"pkg:maven/org.graylog/graylog-parent","ranges":["<3.3.3"],"fixed":["3.3.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}